SEA LILIES, STARFISHES, ETC.—CLARK. 121 
Family SPATANGID. 
Genus Maret, Gray. 
MARETIA PELORIA,! sp. nov. 
(Plate xliv., fig. 1-3.) 
Length of test, 76 mm. ; breadth, 65 mm. ; height, 18 mm. ; 
abactinal system 33 mm. from anterior margin; mouth, 12 
mm. wide by 4mm. long, with a very prominent: lip, its 
anterior margin 20 mm. from test margin; periproct, 9mm. 
in diameter, on the vertical posterior end of test ; subanal 
fasciole, distinct but narrow, its area 24mm. wide by 4mm. 
high at middle; bare sternal area nearly 30mm. wide 
posteriorly. Unpaired petal indistinct, virtually wanting. 
Anterior petals very imperfect, but the posterior series of pore- 
pairs can be distinguished for about 25 mm. from apex. 
Posterior petals fairly well developed, about 35mm. long and 
7mm. wide just proximal to the very slightly narrowed tip; there 
are rather more than 20 pore-pairs on each side of the petal. 
Anterior ambulacrum, although not petaloid, is plainly indi- 
cated as a gradually widening area, covered only by miliary 
spines (or tubercles) ; proximally it is very narrow ; on each 
side is a series of 12-15 simple tube-feet (or pores), at first 
close together but near margin 3-4 mm. apart. Genital pores 
4, large, but close together and concealed by the dense 
growth of miliary spines which covers the whole abactinal 
system and adjoining plates. Remainder of abactinal surface 
covered closely by more or less curved, slender miliary and 
secondary spines, pedicellarie and scattered primaries ; the 
latter are nearly all broken, but when complete are 15-20 mm. 
long and taper to a very slender tip; proximally they are 
hollow ; they are more or less distinctly curved near the base. 
In each antero-lateral interambulacrum there are about 35 
primaries above the ambitus; each is attached to a large, 
perforated tubercle placed in a deeply sunken areola ; in each 
postero-lateral interambulacrum there are some 50 similar 
primaries, and in the posterior interambulacrum there are 
about 25, but these latter are as a rule smaller than the 
primaries of the lateral areas. 
Actinal surface largely free from spines and tubercles of 
any considerable size, except laterally and near anterior 
i. 7é\wptos= huge, immense; in reference to the size, remarkably large 
for a Maretia. 
